add lazy loading on favicon (#2962)

app/layout/aside_feed.phtml

@@ -94,7 +94,7 @@
 						<a class="dropdown-toggle" data-fweb="<?= $feed->website() ?>"><?= _i('configure') ?></a>
 						<?php /* feed_config_template */ ?>
 					</div>
-					<?php if (FreshRSS_Context::$user_conf->show_favicons): ?><img class="favicon" src="<?= $feed->favicon() ?>" alt="✇" /><?php endif; ?>
+					<?php if (FreshRSS_Context::$user_conf->show_favicons): ?><img class="favicon" src="<?= $feed->favicon() ?>" alt="✇" loading="lazy" /><?php endif; ?>
 					<a class="item-title" data-unread="<?= format_number($feed->nbNotRead()) ?>" href="<?= _url('index', $actual_view, 'get', 'f_' . $feed->id()) ?>"><?= $feed->name() ?></a>
 				</li>
 				<?php } ?>

app/views/helpers/index/normal/entry_header.phtml

@@ -28,7 +28,7 @@
 		}
 	}
 	?><li class="item website"><a href="<?= _url('index', 'index', 'get', 'f_' . $this->feed->id()) ?>">
-		<?php if (FreshRSS_Context::$user_conf->show_favicons): ?><img class="favicon" src="<?= $this->feed->favicon() ?>" alt="✇" /><?php endif; ?>
+		<?php if (FreshRSS_Context::$user_conf->show_favicons): ?><img class="favicon" src="<?= $this->feed->favicon() ?>" alt="✇" loading="lazy" /><?php endif; ?>
 		<span><?= $this->feed->name() ?></span></a></li>
 	<li class="item title" dir="auto"><a target="_blank" rel="noreferrer" href="<?= $this->entry->link() ?>"><?= $this->entry->title() ?><?php
 		if ($topline_display_authors):

app/views/index/global.phtml

@@ -38,7 +38,7 @@
 					$url_base['params']['get'] = 'f_' . $feed->id();
 			?>
 			<li id="f_<?= $feed->id() ?>" class="item feed<?= $error, $empty, $feed->mute() ? ' mute' : '' ?>" data-unread="<?= $feed->nbNotRead() ?>" data-priority="<?= $feed->priority() ?>">
-				<?php if (FreshRSS_Context::$user_conf->show_favicons): ?><img class="favicon" src="<?= $feed->favicon() ?>" alt="✇" /><?php endif; ?>
+				<?php if (FreshRSS_Context::$user_conf->show_favicons): ?><img class="favicon" src="<?= $feed->favicon() ?>" alt="✇" loading="lazy" /><?php endif; ?>
 				<a class="item-title" data-unread="<?= format_number($feed->nbNotRead()) ?>" href="<?= Minz_Url::display($url_base) ?>"><?= $feed->name() ?></a>
 			</li>
 			<?php } ?>

app/views/index/reader.phtml

@@ -48,7 +48,7 @@ $content_width = FreshRSS_Context::$user_conf->content_width;
 					<?= _i($item->isFavorite() ? 'starred' : 'non-starred') ?>
 				</a>
 				<a class="website" href="<?= _url('index', 'reader', 'get', 'f_' . $feed->id()) ?>">
-					<?php if (FreshRSS_Context::$user_conf->show_favicons): ?><img class="favicon" src="<?= $feed->favicon() ?>" alt="✇" /><?php endif; ?>
+					<?php if (FreshRSS_Context::$user_conf->show_favicons): ?><img class="favicon" src="<?= $feed->favicon() ?>" alt="✇" loading="lazy" /><?php endif; ?>
 					<span><?= $feed->name() ?></span>
 				</a>
 				<h1 class="title"><a target="_blank" rel="noreferrer" class="go_website" href="<?= $item->link() ?>"><?= $item->title() ?></a></h1>

app/views/subscription/index.phtml

@@ -98,7 +98,7 @@
 			    data-feed-id="<?= $feed->id() ?>"
 			    dropzone="move">
 				<a class="configure open-slider" href="<?= _url('subscription', 'feed', 'id', $feed->id()) ?>"><?= _i('configure') ?></a>
-				<?php if (FreshRSS_Context::$user_conf->show_favicons): ?><img class="favicon" src="<?= $feed->favicon() ?>" alt="✇" /><?php endif; ?>
+				<?php if (FreshRSS_Context::$user_conf->show_favicons): ?><img class="favicon" src="<?= $feed->favicon() ?>" alt="✇" loading="lazy" /><?php endif; ?>
 				<?= $feed->name() ?>
 			</li>
 			<?php 	}